Hi Almec, welcome to the forum! I would definitely recommend trying the book first. I got mine from Amazon, it was only £7.66!
I'm only on page 80 of the book and not got to the actual hypnosis part yet but something weird happened this evening. We were out to dinner and I couldn't finish it! I was suddenly quite full and I just knew I had to stop there. Then came the burps! When I had my original HGB I would get burps after eating, every time without fail! Can't wait to finish the book and listen to the CD for the full effects!